统一的黑洞物理学（2D）

Question

我正在尝试让黑洞像物理学一样吸引任何靠近它的物体，然后将它放入黑洞轨道，像漩涡一样让它到达中心并消失。

我最终得到了这样的东西，但没有用

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[DisallowMultipleComponent]
[ExecuteInEditMode]
[RequireComponent(typeof(CircleCollider2D))]
[RequireComponent(typeof(SpriteRenderer))]
public class BlackHole : MonoBehaviour
{    
    /// <summary>  </summary>
    public const float          GRAVITY_PULL    = 7000.0f;
    /// <summary>  </summary>
    private const float         SWIRLSTRENGTH   = 5f;

    // ------------------------------------------------
    /// <summary>  </summary>
    private float               _gravityRadius  = 7.0f;    
    /// <summary>  </summary>
    private List<Rigidbody2D>   _rigidBodies    = new List<Rigidbody2D>();
    // ------------------------------------------------

#if UNITY_EDITOR     
    void Update()
    {
        if( Application.isPlaying == false )
        {
            _gravityRadius = 
                GetComponent<CircleCollider2D>().radius;
        }
    }
#endif 

    private void LateUpdate()
    {    
        UpdateBlackHole();
    }


    /// <summary>
    /// Attract objects towards an area when they come within the bounds of a collider.
    /// This function is on the physics timer so it won't necessarily run every frame.
    /// </summary>
    /// <param name="in_other">Any object within reach of gravity's collider</param>
    void OnTriggerEnter2D(
        Collider2D in_other
    )
    {
        if ( in_other.attachedRigidbody != null 
            && _rigidBodies != null )
        {                
            //to get them nice and swirly, use the perpendicular to the direction to the vortex
            Vector3 direction = 
                    transform.position - in_other.attachedRigidbody.transform.position;
            var tangent = 
                    Vector3.Cross(direction, Vector3.forward).normalized * SWIRLSTRENGTH;

            in_other.attachedRigidbody.velocity = 
                                            tangent;            
            _rigidBodies.Add( in_other.attachedRigidbody );
        }
    }

    private void UpdateBlackHole()
    {
        if( _rigidBodies != null )
        {
            for (int i = 0; i < _rigidBodies.Count; i++)
            {
                if( _rigidBodies[i] != null )
                {
                    CalculateMovement( _rigidBodies[i] );
                }
            }
        }
    }

    

    private void CalculateMovement(
        Rigidbody2D in_rb
    )
    {
        float distance = 
                Vector3.Distance(
                                transform.position, 
                                in_rb.transform.position
                            ); 

        float gravityIntensity = 
                        distance
                            / _gravityRadius;

        in_rb.AddForce(
                (transform.position - in_rb.transform.position) 
                                                        * gravityIntensity 
                                                                * in_rb.mass   
                                                                        * GRAVITY_PULL 
                                                                                * Time.deltaTime);
        
        in_rb.drag += 0.0001f;
        
        Debug.DrawRay(
                in_rb.transform.position, 
                transform.position - in_rb.transform.position
                );


        if( distance <= 0.1f )
        {
            _rigidBodies.Remove( in_rb );

            Destroy( in_rb.gameObject );
        }
    }
}

这将使物体从黑洞中心上下移动并增加它的速度，这是我想要的东西但不是上下移动我想让它围绕它运行然后靠近到黑洞的中心。

有什么帮助吗？

更新1：通过在开始时加一个小力，我可以让它绕着黑洞旋转，但不会落到它的中心

更新 2：通过添加一些拖拽解决了这个问题，如果有人试图实现同样的事情，请随意使用这个脚本。

Answer 1

你需要给物体一些启动力，因为这会产生水平速度并形成轨道。要使它向内螺旋，启动力要很小，它会以一定的水平速度落向黑洞。

统一的黑洞物理学（2D）

Black Hole Physics ( 2D ) in unity

unity3d

physics

orbital-mechanics